EP 2071122 A3 20121031 - Gear pump cavitation reduction
Title (en)
Gear pump cavitation reduction
Title (de)
Verringerung von Kavitationen bei einer Zahnradpumpe
Title (fr)
Réduction de cavitation de pompe à engrenage
Publication
Application
Priority
US 127907 A 20071211
Abstract (en)
[origin: EP2071122A2] A gear pump 1' for operating with reduced likelihood of cavitation occurrences in the fluid being pumped thereby comprises a pair of gears (2,3) each supported on a corresponding one of a pair of gear shafts (4,5). Teeth provided in each gear (2,3) mesh with at least one tooth of the other when such teeth have been rotated into a meshing region (7) in the gear plane. One of the gear shafts (4,5) is rotatably connectable to a motor. Bearing structures (11) rotatably support corresponding ones of each of the pair of gear shafts (4,5) with the bearing structures (11) having bearing surfaces (11') adjacent those gear sides. A pressurized fluid passageway (20) is provided in at least one of the bearing structures (11) across from the meshing region (7) and extending between surface openings (22,21) at the bearing surface (11') of that bearing structure (11) that are positioned on opposite sides of an alignment axis in that bearing surface (11'), the surface openings (22,21) being separated from one another by at least the width of a tooth provided in the pair of gears (2,3).
IPC 8 full level
F01C 1/08 (2006.01); F01C 1/18 (2006.01); F01C 21/02 (2006.01); F04C 2/08 (2006.01); F04C 2/18 (2006.01)
CPC (source: EP US)
F04C 2/086 (2013.01 - EP US); F04C 2/088 (2013.01 - EP US); F04C 2/18 (2013.01 - EP US); F04C 14/26 (2013.01 - EP US); F04C 15/0026 (2013.01 - EP US); F04C 15/0049 (2013.01 - EP US); F04C 2240/30 (2013.01 - EP US); F04C 2240/52 (2013.01 - EP US); F04C 2240/54 (2013.01 - EP US)
Citation (search report)
- [XY] US 2007178003 A1 20070802 - ZHU JONATHAN [US], et al
- [XY] US 4097206 A 19780627 - SCHONHERR ERICH
- [IY] US 3833317 A 19740903 - RUMSEY R
- [Y] US 2781730 A 19570219 - NEWMIER CARLETON H
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR
Designated extension state (EPC)
AL BA MK RS
DOCDB simple family (publication)
EP 2071122 A2 20090617; EP 2071122 A3 20121031; EP 2071122 B1 20170913; JP 2009162221 A 20090723; US 2009148333 A1 20090611; US 7878781 B2 20110201
DOCDB simple family (application)
EP 08253896 A 20081205; JP 2008312801 A 20081209; US 127907 A 20071211